Specifications

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VAC SIGMA PREAMPLIFIER SPECIFICATIONS (typical)
Type:Vacuum tube line stage with home theater (direct power
amplifier) mode.
Options:Remote control for volume & mute
Dedicated MM phono input
Dedicated MC phono input
Line stage preamplifier:
Gain:24 dB
Maximum input signal:Essentially infinite (attenuation precedes line stage)
Main output:Inverting to RCA
Pin 2 positive “hot” on XLR, pin 3 negative
Tape output:Unity gain from selector, non-inverting (archival correct)
Phono stage preamplifier (optional):
Gain:40 dB MM, 60 dB MC (measured at tape output)
Residual noise:3 mV at output (S/N ratio approx. 69 dB MM)
Overload:117 mV @ 1 kHz = 8 volts RMS output, MM
460 mV @ 10 kHz, MM
Frequency response:RIAA +/- .25 dB
Notes:Does not invert absolute phase.
Tube compliment:
3 x 12AX7 (phono option) (located on circuit board at left side of chassis)
2 x 12AU7/6189A (line stage)
2 x 12AX7 (line stage)